Personally I have found it to go the other way. Negativity about using child care as opposed to not.

Honestly I have had reactions so over the top to my admitting to working and using childcare, that you would think I had told them I put my children in a box with only a muesli bar for sustenance whilst I hang out at cafes for the day.

I agree with others, just be honest. I find when replies are done in a defensive manner they are more likely to be taken the wrong way.